Patent US2774647A successfully refreshed from Google Patents.
US2774647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyeing of polyesters with vat dyes
Assignee: Wyeth Holdings LLC
•
Filing: 1952-05-17
•
Granted: 1956-12-18
•
Expires: 1972-05-17
Abstract
No abstract record available.
Inventors
- 👤 Jerry M Mecco
- 👤 Joseph W Creely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:37
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; D06P1/225; D06P3/00; D06P3/34; D06P3/52; D06P3/523
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A PROCESS OF DYEING FIBROUS POLYESTERS OF A GLYCOL AND A POLYCARBOXYLIC ACID WITH VAT DYES, WHICH COMPRISES HEATING THE SAID POLYESTER FIBERS IN AN AQUEOUS DYEBATH CONTAINING AN UNESTERIFIED LEUCO VAT DYE, A REDUCING AGENT AND SODIUM TRIPOLYPHOSPHATE, AND HAVING A PH BETWEEN 6.5 AND 7.5, AT A TEMPERATURE BETWEEN THE BOILING POINT OF WATER AND 290* F., AND PH OF THE AQUEOUS DYEBATH DURING DYEING BEING MAINTAINED BETWEEN 6.5 AND 7.5 BY MEANS OF THE SODIUM TRIPOLYPHOSPHATE BUFFER, AND OXIDIZING THE DYESTUFF ON THE FIBER AFTER DYEING IS COMPLETE.
Claim 2
Dependent Claim
91 words
A PROCESS OF DYEING FIBROUS POLYESTERS OF A GLYCOL AND A POLYCARBOXYLIC ACID WITH VAT DYES, WHICH COMPRISES HEATING THE SAID POLYESTER FIBERS IN AN AQUEOUS DYEBATH CONTAINING AN UNESTERIFIED LEUCO VAT DYE, A REDUCING AGENT AND SODIUM TRIPOLYPHOSPHATE, AND HAVING A PH BETWEEN 6.5 AND 7.5, AT A TEMPERATURE BETWEEN THE BOILING POINT OF WATER AND 290* F., AND PH OF THE AQUEOUS DYEBATH DURING DYEING BEING MAINTAINED BETWEEN 6.5 AND 7.5 BY MEANS OF THE SODIUM TRIPOLYPHOSPHATE BUFFER, AND OXIDIZING THE DYESTUFF ON THE FIBER AFTER DYEING IS COMPLETE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |